Description of problem: After upgrading from fedora 19 to fedora 20 I experienced various network problems. Closer investigation teached me a consistent pattern for page requests on facebook.com. WiFi on, no cable, IPv6 enabled: connect fails. WiFi on, no cable, IPv6 disabled: success Wifi off, cable plugged in, IPv6 enabled: connect fails Wifi off, cable plugged in, IPv6 disabled: success Wifi on, cable plugged in, (even when IPv6 is disabled on both interfaces): connect fails Looking with wireshark, I can see repeating retransmits in network traffic when connect fails. I don't know which component is to blame, let alone the version of it. But it is unlikely to be related to the kernel, since booting a fc19 kernel does not solve it. I had to fill in a component and I picked one which might be unrelated. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Oh, maybe good to add: this happens in a network where IPv6 is operational. With Fedora 19 it was possible the see IPv6 websites. Very well possible the bug is not exposed to non-IPv6 network environments.
I checked ipv6 traffic with another laptop with fedora 19 (with kernel-3.12.5-200.fc19) in the same network as where I experience problems with Fedora 20 installation. On that f19 laptop ipv6 network traffic works as usual. I used wireshark to capture the traffic on both machines while requesting the facebook.com home page (https). Both communicated over IPv6, bot only the f19 installation was successful. The log of the f20 machine showed retransmits. I'll upload the wireshark output of the f20 machine. FWIW, ping6 to the facebook ipv6 address was successful on both machines.
Created attachment 840797 [details] capture by wireshark of ipv6 traffic of fedora 20 machine to facebook home page
Created attachment 840817 [details] capture by wireshark of ipv6 traffic of fedora 20 machine to facebook home page useless packets filtered out
I just found out that two interfaces up (wifi + cable) with both ipv6 switched off, does not cause problems. So the bug we are facing seems really related broken ipv6 handling.
(In reply to Herald van der Breggen from comment #5) > I just found out that two interfaces up (wifi + cable) with both ipv6 > switched off, does not cause problems. So the bug we are facing seems really > related broken ipv6 handling. The case with multiple interfaces is not consistent. Sometimes when I experience problems when both interfaces are up, closing one interface helps. Not sure what conclusions to draw here.
I have serious problems with ipv6 again since the latest update. In Fedora 19 everything was stable, but since release 20 I see problems with ipv6 e.g. for ipv6 enabled websites like facebook. The website is only accessable if I disable ipv6 on the network interface. This happens on both of my fedora 20 machines. Maybe related, I see also serious problems when multiple interfaces are up (e.g. Wifi and ethernet). If my laptop has wifi enabled and no network cable connected, everything works fine, until I plug in the network cable. Then I get timeout errors when accessing websites. When I disable Wifi then suddenly network traffic is sane again. It looks to me that NetworkManager does not work well when there are multiple ways to communicate (ipv4 via wifi or ipv4 via ethernet or ipv6 via wifi or ipv6 via ethernet). Let me know if I can help debugging.
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